388 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loi 



and middle tibiae. The dense tuft of hair at apex of hind femora, 

 above, brownish fuscous. Tibial scopa pale brown above, more 

 whitish beneath, moderately short and compact, with the hair 

 on dorsal margin about half as long as width of tibia. Second 

 submarginal cell usually considerably narrowed above and re- 

 ceiving recurrent nervure at, or a litte behind, the middle. Third 

 submarginal cell rather short and less than twice as long as the 

 second. Basal nervure slightly postf ureal. Length 8-10 mm.; an- 

 terior wing 6.8-7 mm. 



Male. — Similar to the female in most respects. Face without a 

 light cljrpeal mark. Apex of mandibles dark red. Flagellum dull, 

 slightly brownish beneath. The little ridge marking the base of 

 apical depression of tergites 2 and 3 reddish on each side, form- 

 ing a transverse streak. Apical margin of tergites very narrowly 

 smooth and shiny. Basal process of labrum rounded at apex, and 

 finely foveate beneath at the middle. Antennae short, only mod- 

 erately longer than in the female. Antennal joint 3 equaling 4 

 plus 5. Pubescence whitish to pale ochreous, longer than in the 

 female, especially on the thorax. Hair of face and clypeus mod- 

 erately dense. Hair of abdomen rather short, depressed, and thin, 

 not at all forming bands ; that of tergite 1 much longer and erect. 

 Hair of venter similar to that of tergum, with longer, erect hair 

 on each side of the subapical segments. Medio-apical lobes of 

 stipites virtually obsolete, making the dorso-apical margin almost 

 transverse. Latero-apical lobes of stipites elongate, as usual in 

 this group, slightly angulate on inner margin before the middle 

 and convergent at their tips. Sagittae as in other species of this 

 group, the apex slightly surpassing apex of the stipital lobes. 

 Length 6.5-8 mm. ; anterior wing 5.8-6.2 mm. 



Types. — U.S.N.M. No. 59277. Holotype (female) , allotype, and 

 37 paratypes (8 males, 29 females), San Geronimo, Marin County, 

 Calif., April 23, 1913 (J. C. Bridwell). 



Paratypes, 2 males, 7 females, Santa Rosa, Sonoma County, on 

 Limnanthes douglasii, April 17, 1938 (Embury), and 1 male, 

 Agua Caliente, Sonoma County, on same flower, April 14, 1938 

 (Frazier), in the collection of the Citrus Experiment Station. 



ANDRENA (HESPERANDRENA) LATIVENTRIS, new species 



The female of lativentris differs from other species of Hesperan- 

 drena, except A. limnanthis, in having the mesoscutum black, dull, 

 and strongly tessellate, with the punctures obscure. From limnan- 

 this it differs in the less opaque sculpture; longer, less compact, 

 more plumose tibial scopa; and in having the abdomen more 

 definitely fasciate. The male differs from limnanthis in having the 

 clypeus mainly pale yellow. 



